Hydraulic jack



Aug- 6, 193 H. R. ROSENBEi QRY ET AL HYDRAULIC JACK Original Filed April 1, 1931 2 Sheets-Sheet l Honur R Roacnberrg Rag 'P. Rabcnbzx a. 3

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HYDRAULIC JACK Original Filed April 1, 1931 2 Sheets-Sheet 2 a 2 8 7 a a 40x1 I I IAAAQN/ 4. n 1M a imuiarzfgz M in; imwm 5 w l .m q .m/ Tigaiziiiililfl W Mu 4 6 iw 11+. w v @a a w M a 5 Z 1: a v3 flaw fin v L -m w n 1 Aug. 6, 1935.

Patented Aug. 6, 1935- UNITED STATES PATENT OFFICE HYDRAULIC JACK Homer R. Rosenberry and Ray P. Roaenberry, Cleveland, Ohio, assignors to Carl W. Brand, Cleveland, Ohio Application April 1, 1931, Serial No. 526,808

Renewed March 16, 1934 6 Claims. (Cl. 60-52) This invention relates to hydraulic jacks, and 36 adapted to adiustably engage any one of the the principal object of the invention is to provide rack teeth 31 disposed along the rack member 30. a new and improved device of this character. One end portion of the casting is enlarged to In the drawings accompanying this specificaprovide a hollow projection 38, interiorly threadtion and forming a part of this application we ed, as at 39, communicating with a bore 40 in 5 have shown, for purposes of illustration, one the adjacent portion of the casting, and the bore form which our invention may assume, and in 40 communicates with a pair of branch bores exthese drawings: tending through the casting and constituting Figure 1 is a side elevational view of an empump cylinders 4| and 42, the cylinder 4| combodiment of the invention, municating with a vertically extending duct 43 Figure'Z'. is an enlarged vertical sectional view leading to the interior of the reservoir I 2, having of theconstruction taken on line 2-2 of Figure 3, a valve seat for the accommodation of a ball Figure 3 is a horizontal sectional view correvalve 44 held normally closed by aspring 45 bearsponding substantially to the line 3-3 of Figure 2, ing upon a supporting plug 46, also communicat- Figure 4 is a ,fragmentary vertical sectional ing with an ang'ularly extending duct 41 having view corresponding substantially to the line 4-4 a valve seat for the accommodation of a ball valve of Figure .3, while 48, held in place by a spring 49 supported by a Figure.5 is a fragmentary vertical sectional plug 50, the duct 41 communicating with the view corresponding substantially to the line 5-5 lower end of the cylinder ll through a transverse D of Figure 3.' duct 5|. The cylinder 42 communicates with a 2 0 The embodiment of the invention herein disvertically extending duct52 leading to the inteclosed comprises an elongated base M from which rior of the reservoir l2, having a valve like the rises a ram cylinder H and a'reservoir l2, cast ball valve 44, an angular extending duct 53 havintegrally with the base I0 and with each other, ing a ball valve 54, and a transverse duct 55 leadand having an integrally cast handle l3, the ing to the interior of the cylinder Ii, similar to cylinder CH at'its upper end having an interiorly those already described in detail. 7 threaded enlargement l4, and at its bottom hav- Slidably mounted in the cylinder 4| is a piston ing a threaded opening closed by a threaded plug member 56, its inner end provided with an in- |5 having a a 1 fit n i a ount o e verted cup-shaped packing member 51 secured to and the cylinder H and reservoir l2 communicate the end of the piston member 56 by a screw 58.

at their lower ends-through a port l8, contro led The outer end of the piston member 56 is intey a needle Valve d adj c their pp grally connected to a half-nutifl working in the d Communicate t u h a port 23. bore 40 and provided with a right hand thread Reciprocably mounted in the cylinder H is a 60 engageable with a mutilated right hand tubular Tam extending r u h a ri g 2 thread 6| carried by an actuating screw 62, and

, threaded into the threaded portion of the enthe cylinder 42 is provided with a piston member largement I4, extending also through a second 63 similar to the piston member 56 and having ing 3 vi t d d en a ment with the integrally formed therewith a half-nut 64 also ring 22, and suitable packing being interposed working in the bore and provided with a left between the rings 22 and 23. The ram 2| is'inhand thread 85 engageabl with a, mutilated 4O teriorly threaded at its lower end for the thread left hand thread 66 also formed on the actuating ed ec p a P 24 against wh c bears a screw 62, the half-nuts 59 and 64 being positioned packing member 25 held in place y a plate 26 to travel in opposite directions when the actuating s u d n position by a screw beltlzl, d the screw 62 is rotated. The actuating screw 62 upper end of the ram 2! is also interiorly threadat its inner end is rotatably disposed in a bearing ed for the threaded reception of a threaded plug socket '67, and is provided with a collar 63, b

28, operable to secure to the ram 2| a seat mem-' .ing against washers 69 with balls disposed thereber I00, Provided with a lateral extension 29 carbetween, accommodated in a cup 10 threaded into rying a w d y d posed rack member 30 the threaded portion 39 of the projection 38; and av a tongue and groove s idab e b a g 3 outwardly of the cup 10 there is provided a packbetween, its inner surface and adjacent portion ing member H held in place by a nut 12. The of the outer wall of the cylinder l I, provided along actuating screw 62 extends outwardly beyond its sides with grooves 32 for the slidable and pivthe nut 12 and is provided with a cross pin I3 otal reception of pins 33 threaded into the furcaadapted to fitinto bayonet slots 14 formed in a tions 34 of a seat member 35having a projection socket portion 15 of an operating handle I6.

2, aoiacvo in operation, with the puts in the position as shown in Figure 3, the handle 16 is manipulated to rotate the screw 62 in a clock-wise direction, causing traveler the half nut 59 in an outward direction, drawing the-piston member to therewith, creating a partial vacuum in the cylinder t2, unseating the valve lid and filling the cylinder and duct ll with fluid, the piston member simultaneously traveling inwardly and driving fluid previously withdrawn from the reservoir in the manner described in connection with the piston member 5% in advance thereof,-

unseating the valve and discharging the fluid through the duct 55 into the lower end of the cylinder ll; rotation of the screw is then reversed to reverse the movements of the piston vmembers lid and 63, the screw 62 being rotated first in one direction and then in the opposite direction until the ram 25 has been suihciently elevated, such elevation of course being limited by provision or" the relief port 23 which takes on surplus fluid after the same has been uncovered when the lower end of the rain has reached its upward limit of movement. When the ram is to be lowered the needle valve to is operated to open theduct ill to permit the return of the fluid in the cylinder to the reservoir it.

It will be understood by those skilled in the art that the embodiment herein disclosed accomplishes at least the principal object of the invention, that it has uses and advantages other than those herein particularly referred to, and that various changes and modifications may be made without departing from the spirit of the invention, and accordingly theembodiment disclosed herein is illustrative only and the invention is not limited thereto.

We claim:

1. A hydraulically operable jackhaving a ram cylinder, a reservoir, and a ram in said cylinder, a plurality of operating pump cylinders and pistons communicable with said reservoir and said ram cylinder, and means for efiecting simultaneous opposite reciprocating movement of said pistons, comprising a pair of half nuts each integrally connected to a piston, one having a right hand thread and the other aleft hand thread, and a single rotatable screw having mutilated right and left hand threads thereon respectively engageable with the corresponding thread upon each of said nuts, whereby alternate rotation of said screw in opposite directions will give continuous reciprolatlon of said pistons.

' 2. A hydraulically operable jack heating a ram cylinder, a reservoir, a ram in said cylinder, a plurality of operating pump cylinders and pistons communicable with said reservoir and said ram cylinder, and means for eflfecting positive simultaneous opposite reciprocating movement or" said pistons, comprising a screw having a. righthand thread for operating one of said pistons and a. left-hand thread for operating another of said pistons, and cooperating screw-engaging.

means connected to each of said pistons, whereby alternate rotation of said screw in opposite directions imparts a positive reciprocation of said pistons in either direction.

3. A hydraulically operable jack comprising: a ram cylinder; a ram in said cylinder; a reservoir; a plurality of cooperating cylinders each intersected at one end bya bore communicable with said reservoir; a. plurality of passages each intersected at one end by one of said bores for establishing communication between said reservoir and said ram cylinder; valve means disposed in each of said bores and passages for controlling the flow of fluid therethrough; a piston reciprocally mounted in each of said cooperating cylinders; and screw means connected with correspending screw means on saidpistons, rotatable to'actuate said pistons in opposite directions with respect to each other, whereby fluid is withdrawn from said reservoir, forced through said bores and said passages into said ram cylinder to operate said ram.

4. A hydraulically operable jack, comprising: a ram cylinder; a ram in said cylinder; a reservoir; 9. pair of cooperating cylinders each intersected at one end by a bore, disposed substantially upright, communicable with said reservoir; a pair of passages each intersected at one end by one of said bores for establishing communication between said reservoir and said ram cylinder; valve means disposed in each or said bores and passages for controlling the how of fluid therethrough; a piston reciprocally mounted in each of said ccoperating cylinders; and rotatable means connected with said pistons, rotatable in a direction transverse with respect to the movement of said pistons, for actuating said pistons in opposite directions with respect to each other, whereby fluid is withdrawn from said reservoir, forced through said bores and said passages into said ram cylinder to operate said rain.

5. A hydraulically operable jack, comprising: a casting providing a reservoir; a rain cylinder disposed in said casting; a ram in said ram cylinder; a plurality of spaced apart pump cylinders arranged substantially parallel to each other in said casting, and communicating through ducts in said casting with said'ramcylindcr and with said reservoir; a. hollow projection extending integrally of said casting, and corrununicating at its inner end with said pump cylinders; a pump piston disposed in each of said pump cylinders; screw means, disposed in said hollow projection, connected to said pistons; rotatably mounted screw means disposed in said hollow projection and having its threads in engagement with said piston screw means, and rotatable to actuate said pump pistons in oppositj directions with respect to each other, whereby fluid is withdrawn from said reservoir and forced through said pump cylinders and ducts into said ram cylinder to operate said ram;

6. A hydraulically operable iaclr, comprising: a

' ram cylinder; a ram in said ram. cylinder; a. reservoir; a plurality of pump cylinders communicating through duets with said ram cylinder and with said reservoir; a pump piston reciprocally mounted in each of said pump cylinders;

means connected to one of said pump pistons, and

having a left-hand thread; means connected to another one of said pump pistons and having a right-hand thread; and a single rotatable member having left and right hand threads thereon en= gageable with the corresponding threaded means connected to said pump pistons, whereby alternate rotation of said member in opposite dues-=- 

